Submission #926011

#	Time	Username	Problem	Language	Result	Execution time	Memory
926011		vjudge1	Nautilus (BOI19_nautilus)	C++17	100 / 100	96 ms	536 KiB

nautilus

//Bismillahir-Rahmanir-Rahim

#include <bits/stdc++.h>
#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("O1,O2,O3,Ofast,unroll-loops")
#pragma GCC target("sse,sse2,sse3,sse4,sse4.1,sse4.2,popcnt,avx,avx2")

#define pb push_back
#define pii pair <int, int>
#define pll pair <long long, long long>
#define pld pair <long double, long double>
#define ll long long
#define ld long double
#define x first
#define y second
#define all(v) v.begin(),v.end()
#define sz(s) (int)s.size()
#define skip continue
#define bpop(x) (ll)__builtin_popcountll(x)

using namespace std;

const int N = 5e2 + 7;
const int M = 5e3 + 7;
const int maxA = 2e6 + 7;
const int inf = 1e9 + 7;
const ll INF = 2e18 + 7;
const int MOD = 1e9 + 7;
const ld eps = 1e-9;

pii dir[] = {{0, 1}, {1, 0}, {0, -1}, {-1, 0}};

//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

#define int long long

int n, m, k;
bool border(int i, int j) {
    return i >= 1 && i <= n && j >= 1 && j <= m;
}
int id[255];
bitset <N> fn[N], dp[N], dp2[N];
char s[M];
void shiftWE(char type) {
    for (int i = 1;i <= n;i++)dp2[i] = (dp2[i] | ((type == 'W' ? (dp[i] >> 1) : (dp[i] << 1)) & fn[i]));
}
void shiftNS(char type) {
    for (int i = 1;i <= n;i++)dp2[i] = (dp2[i] | ((type == 'N' ? dp[i + 1] : dp[i - 1]) & fn[i]));
}
void solve() {
    cin >> n >> m >> k;
    for (int i = 1;i <= n;i++) {
        for (int j = 1;j <= m;j++) {
            char c;
            cin >> c;
            fn[i][j] = (c == '.' ? 1 : 0);
        }
    }
    for (int i = 1;i <= k;i++)cin >> s[i];
    id['W'] = 0, id['N'] = 1, id['E'] = 2, id['S'] = 3;
    int ans = 0;
    for (int i = 1;i <= n;i++) {
        for (int j = 1;j <= m;j++) {
            if (fn[i][j])dp[i][j] = 1;
        }
    };
    for (int step = 1;step <= k;step++) {
        //cout << step << ":\n";
        if (s[step] == '?')shiftWE('W'), shiftWE('E'), shiftNS('N'), shiftNS('S');
        else {
            char type = s[step];
            if (type == 'E' || type == 'W')shiftWE(type);
            else shiftNS(type);
        }
        for (int i = 1;i <= n;i++)dp[i] = dp2[i], dp2[i].reset();
    }
    for (int i = 1;i <= n;i++)ans += dp[i].count();
    cout << ans;
}
signed main() {
    //srand(time(NULL));
    ios_base::sync_with_stdio(0);
    cout.tie(0);
    //freopen("tests.in", "r", stdin);
    //freopen("milkorder.out", "w", stdout);
    int test = 1;
    //cin >> test;
    for (int t = 1;t <= test;t++) {
        //cout << "Case " << t << ": ";
        solve();
    }
    return 0;
}

Compilation message (stderr)

nautilus.cpp:4: warning: ignoring '#pragma comment ' [-Wunknown-pragmas]
    4 | #pragma comment(linker, "/stack:200000000")
      |

• Subtask 1: 29 / 29
• Subtask 2: 37 / 37
• Subtask 3: 34 / 34